hempy



G. L. HEMPY.

TRACTION WHEEL.

APPLICATION FILED mmzo. l9l9.

1,309,521 Patented July 8, 1919.

' Y" 0 f 0 15 16 d1 11 o 8 Gear eL.Hempy 44, SHOW L93 9 GEORGE I). HEMPY, 0F TRURO TOWNSHIP, FRANKLIN COUNTY OHIO, ASSIGNUR 0F ONE-HALF TO ORLA H. IlZGSY'lER, 01 COLUMBUS, OHIO.

it ,fltltiJi21.

Specification of Letters Patent.

Patented July 8, 1919.

Anpliea'tion tiled January :50, 1919. Serial No. 271,935.

To all whom it may concern:

Be it known that I, Gnonon L. Henry, a citizen of the United States, residing at Truro township, in the county ol Franklin and State of Ohio, have invented a certain new and useful Improvement in '.l.ractionl/vheels of which the following is a specification.

The invention relates more particularly to traction wheels of the species containing lugs or traction elements adapted to be projected beyond the rim of the wheel for the purpose of affording a non-slipping grip on the ground.

The object of the invention is an improved. and simplified construction whereby the operation of the lugs is made easier and the parts more susceptible of economical repair or replacement.

The invention is ci'noodied in the example herein illustrated and described the :ieaturcs of novelty being finally clz'iin'ied.

In the accompanying drawing- Figure 1 is a view in elevation of the outer side of a wheel equipped with'the invention.

Fig. 2 is a cross section of the rim at the line II-II F ig. 1 looking to the left.

Fig. 3 is a section on the line III---III Fig. 2.

Fig. 4 1s an isometric perspective on a larger scale of the lug or traction element.

Fig. 5 is a similar view of the member for directly actuating the lug or tract-ion element.

In the views 6 designates the hub, 7 the spokes and 8 the rim ol a traction wheel, these parts being of any suitable construe tion. The rim has cut or formed in it be tween the spokes a suitable number of transverse slots and riveted to the inner side of the rim for each of said slots is a housing 10 having a passage ll) alining radially of the wheel with the slot. The neck of the housing 10 has a cross passage l0" inter-- scct-ing at right angles v aid radially extending passage 10. Located in each of the p assages 10 is the shank o l the lug or traction element 11. that element being prel'erablv formed with a head of greater width than the corresponding width of the shank. In the shank of the traction element or lug is formed a double or compound slot ll ill". the parts of which are connected by an opening, and through this shit and the (J'oss paw sag-e 10 in the housing ll) is inserted a omponi'id or double wedge member 12, said member being sustained and guided by thehousing. The wedge member 12 has at one side an edge 12 that bears against the shank oi the lug at the outer end of the slot 11" and said wedge member has at the opposite side an inclined edge 12 that bears against the shank at the inner end of the slot 11 so that when the wedge member is moved snlliciently in one direction to the right as shown in Fig. 3-the traction lug is projected beyond the rim of the wheel and when moved in the opposite direction or-to the left said lug is drawn inward so as not to project beyond said rim. The other edges of the wedge block are parallel to lit and move in a right line through the cross passage 10" of the neck of the h'onsing so that when the traction lug is projected the latter is firmly supported by the wedge member in all positions.

I have shown the wheel equipped with eight of the traction elements. but the numher to be employed in connection ith am) given wheel may be varied as desired. It is an important feature of my improvement that a pluralit of the traction elements. less than the whole number, be provided with means for simultaneously operating them. The reason for this is that it is impracticable to project that traction element or lug or those traction elements that are nearest the ground without first lifting the engine and wheels oil" the ground. In the instance shown I have provided means for simultaneously operating the traction elements in groups of tour. Said means includes a curved bar 1 mounted to slide in retaining members 'l-lembracing the bar, said retaining members being applied to the spokes. The bar 13 has several slotted extensions 15 each engaging a pin '22 on the corrcs mmling wedge member .12. The slotted extensions 17 permit a rectilinear movement of the wedge member notwithstanding the curvilinear movement ol the bar 13. The means for Shifting the. bar 13 Consists of a bell-crank lever 16 't'nlcrumed at 17 on one of the spokes ol the wheel. the shorter arm of said lever having a slot 18 engaging a pin 19 on the bar 13 while the longer arm of said lcvcr has suitable holes as at 30 to p r it. th i scrtion of a locking pin through it and a corrcsponding hole 21 in the vspoke to hold said lcvcr at the limits of its movements. The

interposition of the longer arm of the lever .16 holds the traction elements or lugs withdrawn and the inner position of that lever holds them projected into working position.

The device as thus constructed can be apto many if not all the traction wheels new: in common use and it is capable of ready and'economical repair. A worn or damaged traetionelement or lug can be removed and thehousing can be replaced with a new one by removing its securing rivet-s.

, In practice that group ot traction eleinents which is uppermost willfbe first projected and when the engine has moved to ,bring the other group uppermost that grou jwill be projected. Oftentimes it will be su 'eient to project one group only: as where the 'diflicult place is, of small area.

; The parts are susceptible of some modificationwithout departure from the invention a"s' v clai' ied.

i lV -t'jI claim is: I

, li Iii combination with a wheel having a.

- slotted .rim, a. housing attached to the rim ""radial with reference to the wheel for the at said slot, said housing having a passage reception of a traction lug'a'nd a cross passage. for an'a'ctuating member for said lug extending in a plane coinciding with the plane of the wheel, a traction lug in said ra-- dial passage, :1 separate lugac-tuating memher in said cross passage for actuating said traction lug, said'lug actuating member beactuating member therefor, means for actuating the wedge member having a curvilinear movement and means whereby a rectilinear moven'ient is imparted to the lug actuating member.

3. In combination with a wheel having a plurality of slots in its rim, a plurality of housings attached tothe rim at said slots,

said housings each having a' passage radial with referenceto the wheel for the reception of a traction lug and a cross passage for an actuating member for said lug extending in a plane coinciding with the plane of the wheel. a traction lug in each of said radial passages, a separate wedging member in each of said cross passages fol-actuating the traction lug. said lugs being'movable in a plane coinciding with the plane of the wheel, a bar 13 mounted on the wheel to move in acurved path. on the wheel, and removable means engaging said bar with said wedging members whereby a plurality of them maybe actuated by movement of the bar.

v GEORGE 13. HEMPY; 

